Segment And Geographic Information (Financial Information Operating Segments) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net financing revenue (loss)	$ 889,000,000	$ 737,000,000	$ 2,576,000,000	$ 2,005,000,000
Other revenue	375,000,000	371,000,000	1,061,000,000	1,159,000,000
Total net revenue (loss)	1,264,000,000	1,108,000,000	3,637,000,000	3,164,000,000
Provision for loan losses	102,000,000	141,000,000	302,000,000	361,000,000
Total noninterest expense	742,000,000	762,000,000	2,276,000,000	2,521,000,000
Income (loss) from continuing operations before income tax expense	420,000,000	205,000,000	1,059,000,000	282,000,000
Assets	149,195,000,000	150,556,000,000	149,195,000,000	150,556,000,000	151,167,000,000
Net Interest Income (Loss) after Provision for Loan Losses	800,000,000	600,000,000	2,300,000,000	1,600,000,000
Automotive finance operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	850,000,000	800,000,000	2,554,000,000	2,350,000,000
Other revenue	69,000,000	65,000,000	195,000,000	207,000,000
Total net revenue (loss)	919,000,000	865,000,000	2,749,000,000	2,557,000,000
Provision for loan losses	109,000,000	150,000,000	367,000,000	350,000,000
Total noninterest expense	395,000,000	376,000,000	1,167,000,000	1,143,000,000
Income (loss) from continuing operations before income tax expense	415,000,000	339,000,000	1,215,000,000	1,064,000,000
Assets	110,937,000,000	108,609,000,000	110,937,000,000	108,609,000,000
Insurance Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	16,000,000	16,000,000	47,000,000	43,000,000
Other revenue	287,000,000	293,000,000	849,000,000	926,000,000
Total net revenue (loss)	303,000,000	309,000,000	896,000,000	969,000,000
Provision for loan losses	0	0	0	0
Total noninterest expense	243,000,000	226,000,000	785,000,000	780,000,000
Income (loss) from continuing operations before income tax expense	60,000,000	83,000,000	111,000,000	189,000,000
Assets	7,178,000,000	7,323,000,000	7,178,000,000	7,323,000,000
Mortgage Operations [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	9,000,000	13,000,000	35,000,000	62,000,000
Other revenue	0	19,000,000	13,000,000	(6,000,000)
Total net revenue (loss)	9,000,000	32,000,000	48,000,000	56,000,000
Provision for loan losses	(7,000,000)	(12,000,000)	(55,000,000)	14,000,000
Total noninterest expense	19,000,000	48,000,000	62,000,000	293,000,000
Income (loss) from continuing operations before income tax expense	(3,000,000)	(4,000,000)	41,000,000	(251,000,000)
Assets	7,402,000,000	8,562,000,000	7,402,000,000	8,562,000,000
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net financing revenue (loss)	14,000,000	(92,000,000)	(60,000,000)	(450,000,000)
Other revenue	19,000,000	(6,000,000)	4,000,000	32,000,000
Total net revenue (loss)	33,000,000	(98,000,000)	(56,000,000)	(418,000,000)
Provision for loan losses	0	3,000,000	(10,000,000)	(3,000,000)
Total noninterest expense	85,000,000	112,000,000	262,000,000	305,000,000
Income (loss) from continuing operations before income tax expense	(52,000,000)	(213,000,000)	(308,000,000)	(720,000,000)
Assets	23,678,000,000	26,062,000,000	23,678,000,000	26,062,000,000
Commercial Finance Operations [Member]
Segment Reporting Information [Line Items]
Assets	$ 1,700,000,000	$ 1,600,000,000	$ 1,700,000,000	$ 1,600,000,000